.header {
    background: #121212;
}

.navbar {
    text-align: center;
}

.navbar ul li{
    display: inline-grid;
    padding: 1% 3%;
    cursor: pointer;
    color: #ffffff;
    border-bottom: 1px #121212 solid;
}

.navbar ul:hover li:hover{
    border-bottom: 1px #86f3f3 solid;
    color: #4493f8;
}

@media (max-width: 480px) {
    .header{
        padding: 5%;
        width: auto;
        height: auto;
    }
    .navbar ul li{
        padding: 1% 1.8%;
        font-size: 1.45em;
    }
}